change (CI): CARGO_HOME, RUST_INCREMENTAL, no artifacts for needs, only changed to rules

[TriplEight]

• returns CARGO_HOME, cc cache prepopulation #386 "error: failed to download <dependency>" because of CARGO_HOME rust-lang/cargo#8120 and potential fix of it here: "Object not found" updating registry rust-lang/cargo#4007
• with RUST_INCREMENTAL=0 CI has to work faster allowing sccache to cache more artifacts, on the other side incremental compilation is a pretty flaky thing on CIs.
• needs do not actually require uploading artifacts from the mentioned jobs, this is done solely for the sakes of speed, leveraging DAG in GitLab
• soon to be™ deprecated only changed to rules

[codecov-commenter]

Codecov Report

Merging #495 into master will increase coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #495      +/-   ##
==========================================
+ Coverage   67.00%   67.17%   +0.17%     
==========================================
  Files         148      148              
  Lines        6300     6300              
==========================================
+ Hits         4221     4232      +11     
+ Misses       2079     2068      -11     

Impacted Files	Coverage Δ
lang/ir/src/ir/item_impl/impl_item.rs	42.22% <0.00%> (+2.22%)	⬆️
primitives/src/key.rs	82.27% <0.00%> (+12.65%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 529bd58...7bd0e85. Read the comment docs.

[Robbepop]

How were you able to merge this without approval? 🤔